Title:
STRUCTURE OF CYLINDER PERIPHERAL WALL SURFACE
Document Type and Number:
Japanese Patent JP2019120185
Kind Code:
A
Abstract:
To provide structure of a cylinder peripheral wall surface which allows for reduction of friction generated between a piston and a cylinder peripheral wall surface in an expansion stroke.SOLUTION: A peripheral wall surface 21 of a cylinder 20 has as regions which a piston 25 opposes, an upper-stage region 41, a middle-stage region 42 and a lower-stage region 43. The middle-stage region 42 is comprised of a first region 46 having a plurality of uniformly/regularly-aligned recesses 45 at a first area ratio, and a second region 47 located at a thrust side to which the piston 25 is deviated at the descending movement of the piston 25, second region 47 being a region in which both sides of the cylinder 20 in a peripheral direction, and a descending movement direction side of the piston 25 are surrounded by the first region 46, and the recesses 45 are not formed.SELECTED DRAWING: Figure 1
Inventors:
KUWANO HIROHISA
NAKANO YASUO
NAKANO YASUO
Application Number:
JP2018000075A
Publication Date:
July 22, 2019
Filing Date:
January 04, 2018
Export Citation:
Assignee:
HINO MOTORS LTD
International Classes:
F02F1/00; F02F1/20; F16J10/04
Attorney, Agent or Firm:
Makoto Onda
Hironobu Onda
Hironobu Onda